linux-kernel - Re: [PATCH v8 1/1] vfio/nvgpu: Add vfio pci variant module for grace hopper

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Message-ID: <BY5PR12MB3763D6DA3374A84109D0B2E7B0F2A@BY5PR12MB3763.namprd12.prod.outlook.com>
Date:   Mon, 11 Sep 2023 08:17:34 +0000
From:   Ankit Agrawal <ankita@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>
CC:     Alex Williamson <alex.williamson@...hat.com>,
        Yishai Hadas <yishaih@...dia.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        Aniket Agashe <aniketa@...dia.com>, Neo Jia <cjia@...dia.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        "Tarun Gupta (SW-GPU)" <targupta@...dia.com>,
        Vikram Sethi <vsethi@...dia.com>,
        Andy Currid <acurrid@...dia.com>,
        Alistair Popple <apopple@...dia.com>,
        John Hubbard <jhubbard@...dia.com>,
        Dan Williams <danw@...dia.com>,
        "Anuj Aggarwal (SW-GPU)" <anuaggarwal@...dia.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 1/1] vfio/nvgpu: Add vfio pci variant module for grace
 hopper

>> I don't see the goal as perfect emulation of the real HW.
>>
>> Aiming for minimally disruptive to the ecosystem to support this
>> quirky pre-CXL HW.
>>
>> Perfect emulation would need a unique VFIO uAPI and more complex qemu
>> changes, and it really brings nothing of value.
>>
>
> Does it mean that this requires maintaining a new guest driver
> different from the existing one on bare metal?

No, the VM would use the same Nvidia open source driver that is used by the
bare metal. (https://github.com/NVIDIA/open-gpu-kernel-modules).